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backend/venv/Lib/site-packages/hypothesis/utils/dynamicvariables.py

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+# This file is part of Hypothesis, which may be found at
+# https://github.com/HypothesisWorks/hypothesis/
+#
+# Copyright the Hypothesis Authors.
+# Individual contributors are listed in AUTHORS.rst and the git log.
+#
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/.
+
+import threading
+from contextlib import contextmanager
+
+
+class DynamicVariable:
+    def __init__(self, default):
+        self.default = default
+        self.data = threading.local()
+
+    @property
+    def value(self):
+        return getattr(self.data, "value", self.default)
+
+    @value.setter
+    def value(self, value):
+        self.data.value = value
+
+    @contextmanager
+    def with_value(self, value):
+        old_value = self.value
+        try:
+            self.data.value = value
+            yield
+        finally:
+            self.data.value = old_value